package pri.ydy.educenter.controller;

import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import pri.ydy.commonUtils.JwtUtils;
import pri.ydy.educenter.Utils.ConstantWxUtils;
import pri.ydy.educenter.Utils.HttpClientUtils;
import pri.ydy.educenter.entity.UcenterMember;
import pri.ydy.educenter.service.UcenterMemberService;
import pri.ydy.serviceBase.exceptionhandler.GuliException;

import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @Author: YeDongYong
 * @Date:2020/12/25
 * @Content:
 */
@Controller//请求地址，并不返回json数据
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    //2.获取扫描人信息，添加数据
    @GetMapping("callback")
    public String callback(String code,String state){
        try {
            //1.获取code值，临时票据，类似于验证码

            //2.拿着code请求微信固定的地址，得到两个值accsess_token和openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接三个参数：id，秘钥，code
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );
            //请求拼接好的地址，得到两个返回值accsess_token和openid
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
            //accessTokenInfo是一个字符串，包含需要的json数据，从其中拿出我们需要的数据，从string中拿数据
            //把accessTokenInfo转为map集合，根据key得到数据
            //使用json转换工具gson
            Gson gson=new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token =(String) mapAccessToken.get("access_token");
            String  openid =(String) mapAccessToken.get("openid");


            //把扫码人信息添加到数据库
            //根据唯一openid判断有无相同信息
            UcenterMember member= memberService.getOpenIdMember(openid);
            if(member==null){//不存在微信数据
                //3.拿着得到的access_token和openid ，再去请求微信的固定地址，获取扫码人信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //从扫码人信息userInfo中获取信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String  nickname =(String) userInfoMap.get("nickname");//昵称
                String  headimgurl =(String) userInfoMap.get("headimgurl");//头像

                member=new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            //最后：返回首页面，根据路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;

        } catch (Exception e) {
            e.printStackTrace();
           throw new GuliException(20001,"登录失败");
        }

    }

    //1.生成wx扫描二维码,不返回R结果，直接生成二维码
    @GetMapping("login")
    public String getWxCode(){
        //固定地址，后面拼接参数
        // 微信开放平台授权baseUrl %s相对于？ 占位符
        //String url="https://open.weixin.qq.com/connect/qrconnect?a=1&b=2";
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
        String redirect_url=ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirect_url= URLEncoder.encode(redirect_url,"utf-8");
        }catch (Exception e){
            e.printStackTrace();
        }
        String url= String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirect_url,
                "yedongyong"
        );
        //请求微信地址,重定向微信地址
        return "redirect:"+url;
    }

}
